"Turbo DPSK": iterative differential PSK demodulation and channel decoding
作者： P. Hoeher , J. Lodge
DOI: 10.1109/26.771340
关键词:
摘要: Multiple symbol differential detection is known to fill the gap between conventional of MPSK (M-DPSK) and coherent M-PSK with encoding (M-DEPSK). Emphasis has been so far on soft-input/hard-output detectors applied in uncoded systems. In this paper, we investigate a receiver structure suitable for coded DPSK signals static time-varying channels. The kernel an posteriori probability (APP) demodulator. This demodulator accepts priori information produces reliability outputs. Due availability outputs, outer soft-decision channel decoder can be applied. acceptance information, if also outputs iterative ("turbo") processing done. proposed "APP demodulator" uses linear prediction per-survivor estimate response. overall transmission scheme represents type serial "turbo code," encoder concatenated convolutional code, separated by interleaving. investigated system potential improve performance PSK without perfect estimation fading cases! Only small number iterations are required. under investigation several existing standards changing format. Results presented convolutionally 4-DPSK modulation transmitted over Gaussian Rayleigh flat-fading channel, respectively.
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